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POUsing Factory Pattern in Java
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copied!<p>I am studying the Factory pattern and I have some doubts about which is the best way to buil it. I developed two progamas that do exactly the same, the only difference is the code that implements the pattern in question. After comparison could help me find:</p> <ol> <li>Code which one is better for reusability, for the JVM, for performance, etc, number 1 or 2?<br></li> <li>Is a 3.er optimal way to do even more?</li> </ol> <p><strong>Shared Classes</strong></p> <p><strong>Artist</strong></p> <pre><code> public class ArtistFrame extends AbstractFactoryJInternalFrame { public ArtistFrame(String title, int x, int y) { super(title, x, y); } @Override void makeButtons() { JButton addBtn = new JButton("Add"); addBtn.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent actionEvent) { //to do } }); JButton saveBtn = new JButton("Save"); saveBtn.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent actionEvent) { //to do } }); JButton deleteBtn = new JButton("Delete"); deleteBtn.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent actionEvent) { //to do } }); JButton cancelBtn = new JButton("Cancel"); cancelBtn.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent actionEvent) { //to do } }); add(addBtn, BorderLayout.SOUTH); add(saveBtn, BorderLayout.NORTH); add(deleteBtn, BorderLayout.EAST); add(cancelBtn, BorderLayout.WEST); } } </code></pre> <p><strong>Track</strong></p> <pre><code>public class TrackFrame extends AbstractFactoryJInternalFrame { public TrackFrame(String title, int x, int y) { super(title, x, y); } @Override void makeButtons() { JButton addBtn = new JButton("Add"); addBtn.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent actionEvent) { //to do } }); JButton saveBtn = new JButton("Save"); saveBtn.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent actionEvent) { //to do } }); JButton deleteBtn = new JButton("Delete"); deleteBtn.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent actionEvent) { //to do } }); JButton cancelBtn = new JButton("Cancel"); cancelBtn.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent actionEvent) { //to do } }); add(addBtn, BorderLayout.NORTH); add(saveBtn, BorderLayout.CENTER); add(deleteBtn, BorderLayout.EAST); add(cancelBtn,BorderLayout.WEST); } } </code></pre> <p><strong>Album</strong></p> <pre><code>public class AlbumFrame extends AbstractFactoryJInternalFrame { public AlbumFrame(String title, int x, int y) { super(title, x, y); } @Override void makeButtons() { JButton addBtn = new JButton("Add"); addBtn.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent actionEvent) { //to do } }); JButton saveBtn = new JButton("Save"); saveBtn.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent actionEvent) { //to do } }); JButton deleteBtn = new JButton("Delete"); deleteBtn.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent actionEvent) { //to do } }); JButton cancelBtn = new JButton("Cancel"); cancelBtn.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent actionEvent) { //to do } }); add(addBtn, BorderLayout.EAST); add(saveBtn, BorderLayout.WEST); add(deleteBtn, BorderLayout.NORTH); add(cancelBtn, BorderLayout.SOUTH); } } </code></pre> <p><strong>Case 1</strong><br> Main Class</p> <pre><code>public class TestSwing extends JFrame { JDesktopPane desktop; AbstractFactoryJInternalFrame artistFrame; AbstractFactoryJInternalFrame albumFrame; AbstractFactoryJInternalFrame trackFrame; public TestSwing() { setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); setSize(500,300); desktop = new JDesktopPane(); artistFrame = AbstractFactoryJInternalFrame.getFrame("Artist",10,10); albumFrame = AbstractFactoryJInternalFrame.getFrame("Album", 20, 20); trackFrame = AbstractFactoryJInternalFrame.getFrame("Track", 30,30); desktop.add(artistFrame); desktop.add(albumFrame); desktop.add(trackFrame); setContentPane(desktop); setVisible(true); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { TestSwing ts = new TestSwing(); } }); } } </code></pre> <p>Factory Class public abstract class AbstractFactoryJInternalFrame extends JInternalFrame {</p> <pre><code>protected AbstractFactoryJInternalFrame(String title, int x, int y) { super(title, true, true, true, true); setLocation(y,y); } public static AbstractFactoryJInternalFrame getFrame(String title, int x, int y) { AbstractFactoryJInternalFrame frame = null; if (title.equals("Artist")) { frame = new ArtistFrame(title, x, y); } else if (title.equals("Album")) { frame = new AlbumFrame(title, x, y); } else { frame = new TrackFrame(title, x, y); } frame.makeButtons(); frame.pack(); frame.setVisible(true); return frame; } abstract void makeButtons(); } </code></pre> <p><strong>Case 2</strong><br> Main Class</p> <pre><code>public class TestSwing extends JFrame { JDesktopPane desktop; AbstractFactoryJInternalFrame artistFrame; AbstractFactoryJInternalFrame albumFrame; AbstractFactoryJInternalFrame trackFrame; public TestSwing() { setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); setSize(500,300); desktop = new JDesktopPane(); artistFrame = new ArtistFrame("Arist",10,10); albumFrame = new AlbumFrame("Album", 20, 20); trackFrame = new TrackFrame("Track", 30,30); desktop.add(artistFrame); desktop.add(albumFrame); desktop.add(trackFrame); setContentPane(desktop); setVisible(true); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { TestSwing ts = new TestSwing(); } }); } } </code></pre> <p>Factory Class</p> <pre><code> public abstract class AbstractFactoryJInternalFrame extends JInternalFrame { protected AbstractFactoryJInternalFrame(String title, int x, int y) { super(title, true, true, true, true); setLocation(y,y); makeButtons(); pack(); setVisible(true); } abstract void makeButtons(); } </code></pre>

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